کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1808439 | 1525161 | 2016 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Single-atom conductance of Y Single-atom conductance of Y](/preview/png/1808439.png)
Y is a trivalent metal like Al but has one d valence electron instead of one p valence electron in Al. This makes a single-atom contact of Y a suitable playground for investigating how d valence electrons contribute to the single-atom conductance. In this paper, we present the results of our theoretical and experimental studies of the single-atom conductance of Y. We carried out conductance measurements on Y contacts and found that the conductance histogram observed at 4 K exhibits a single broad peak at 1.9G01.9G0. We also calculated the electron transmission through a Y single-atom contact and obtained the total transmission 1.75 at the Fermi level. Both our theoretical and experimental findings consistently indicate that the single-atom conductance of Y lies at (1.8–1.9)G0(1.8–1.9)G0, which is nearly twice as high as that of Al. This increase in the single-atom conductance is due to the second and the third eigenchannels of Y which accomplish higher transmission compared to those of Al. We found that the difference in the contours of sd- and sp-eigenchannels can account for the higher transmission of the sd-eigenchannels.
Journal: Physica B: Condensed Matter - Volume 488, 1 May 2016, Pages 57–61